package com.zy.je.common.core.utils.crypto;

import com.zy.je.common.core.exception.BizException;
import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;

/**
 * @Description: 加密工具
 */
@Slf4j
public class Md5Util {

    private static final String[] HEXDIGITS = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n += 256;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return HEXDIGITS[d1] + HEXDIGITS[d2];
    }

    public static String encode(String origin, String charsetName) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetName == null || "".equals(charsetName)) {
                resultString = byteArrayToHexString(md.digest(resultString.getBytes("UTF-8")));
            } else {
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetName)));
            }
        } catch (Exception e) {
            throw new BizException(e);
        }
        return resultString;
    }

    public static String encode(String origin) {
        return encode(origin, "UTF-8");
    }

    public static void main(String[] args) {
        String encode = Md5Util.encode("77gx13p.1723083581790.iJIUzI1NiJ9.eyJsb2dpblR5cGUiOiJsb2dpbiIsImxvZ2luSWQiOiJiYTZlYjI4NTUyODJjZTUyOTUzMmNhZGFhNGI");
        log.debug(encode);
    }
}
